Despite the considerable variance between adolescents in the onset and pace of puberty, the sequence of physical changes themselves are predictable. These changes can be divided into two categories: 

- Primary Sexual Characteristics 
- Secondary Sexual Characteristics

Physical Development During Adolescence 

Adolescence is marked by the emergence of more complex thinking abilities, including a shift from concrete to abstract thought. This development, which Piaget termed the formal operational stage, enables teenagers to consider multiple viewpoints, analyze hypothetical situations, debate complex ideas like politics and justice, and formulate new concepts. This cognitive maturation also often leads to adolescents questioning authority and challenging established societal norms.

Cognitive Development During Adolescence

A key psychosocial task during adolescence, particularly in the United States, is the development of independence from parents while simultaneously maintaining a connection with them. This period also involves prioritizing peer relationships and, according to Erikson's theory, establishing a personal identity.

Psychosocial Development during Adolescence

Emerging adulthood is a recently identified stage of lifespan development that bridges adolescence and full adulthood. Typically occurring from age 18 to the mid-20s, this period is considered a transitional phase where the primary focus is on exploring one's identity, particularly in the contexts of work and love. This stage is especially prominent in Western cultures, where the attainment of traditional adult milestones is often delayed.

Emerging Adulthood

The developmental shift from adolescence to adulthood can be a difficult period, with challenges arising from the biological timing of puberty and the socially extended phase of emerging adulthood.

Challenges in the Transition from Adolescence to Adulthood

Adolescence is described as a period of significant change across three key domains. Analyze this developmental stage by describing a distinct milestone or change within each of the physical, cognitive, and psychosocial domains. Then, explain how a change in one of these domains might influence development in another.

Interconnected Development in Adolescence

In the fifth stage of psychosocial development, identity versus role confusion, which occurs during adolescence (ages 12–18), the primary task is to develop a sense of self. Adolescents grapple with the fundamental questions “Who am I?” and “Who do I want to be?” as they explore their identity, often by experimenting with different personas. Successfully navigating this stage leads to a strong sense of identity, enabling individuals to stay true to their beliefs and values. Failure to resolve this conflict, either through apathy or by conforming to external pressures, results in a weak sense of self and confusion about one's identity and future.

Stage 5 of Erikson's Theory of Psychosocial Development

Peers are a primary influence on our development during adolescence.

Peer Influence in Adolescence

Adolescence is the developmental stage that begins with puberty and concludes at the start of emerging adulthood, typically spanning the ages of 12 to 18. This period serves as an extended transition between childhood and adulthood and is characterized by predictable milestones across three domains: physical, cognitive, and psychosocial development.

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Columbia University

New Mexico Highlands University

To study the human lifespan, developmental psychologists often segment it into distinct, age-based periods. This approach, which is similar to the structure of theories like Erikson's, allows for a focused examination of development. The primary stages include prenatal development, infancy, childhood, adolescence, and adulthood.

Age-Based Stages of Lifespan Development

The concept of adolescence is a social construct, meaning it is not a universal stage of life across all societies and time periods. In pre-industrial societies, for example, individuals were typically considered adults upon reaching physical maturity. The modern idea of adolescence as an extended period between childhood and adulthood is a more recent development.

Adolescence as a Social Construct

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Adolescence

Adulthood, which begins around age 20, is a major life stage characterized by significant developments across physical, cognitive, and emotional domains. This period is typically divided into three substages: early, middle, and late adulthood.

Adulthood

Psychological topics to consider from infancy to childhood include:

- Physical development
- Cognitive development 
- Attachment 
- Self-concept

Infancy to Childhood in Psychology

Developmental milestones are key skills and abilities that children are expected to achieve by a certain age. For each milestone, there is an average age of achievement and a broader range of ages within which most children will reach it. These benchmarks, which include motor skills like sitting and holding one's head up, serve as guidelines for tracking a child's development against normative data.

Developmental Milestones

Prenatal development encompasses the orderly and delicate sequence of growth from a single-cell structure to birth. This crucial period of human development is typically divided into three main stages: germinal, embryonic, and fetal.

Prenatal Development

- Basic Trust Versus Mistrust
- Autonomy Versus Shame and Doubt
- Initiative Versus Guilt
- Industry Versus Inferiority
- Identity Versus Role Confusion
- Intimacy Versus Isolation
- Generatively Versus Stagnation
- Integrity Versus Despair

Stages in Erikson's Theory of Psychosocial Development

A research team is designing a study to understand how problem-solving abilities change throughout a person's life. They decide to structure their research by observing and comparing separate groups of people from distinct age categories: childhood, adolescence, and adulthood. Critically evaluate this methodological choice. What are the main benefits of organizing the study around these discrete age-based periods, and what are the significant drawbacks or potential inaccuracies that might arise from this approach?

Critique of the Stage-Based Approach to Development

Analyze the two scenarios below. Based on the differences you observe, what can you conclude about the nature of the life stage that occurs between childhood and full adulthood? Explain your reasoning.

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